/*
    * Copyright 2012-2025 CodeLibs Project and the Others.
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *     http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied. See the License for the specific language
   * governing permissions and limitations under the License.
   */
  package org.codelibs.fess.job;
  
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.codelibs.fess.app.service.CrawlingInfoService;
  import org.codelibs.fess.app.service.JobLogService;
  import org.codelibs.fess.app.service.SearchLogService;
  import org.codelibs.fess.app.service.UserInfoService;
  import org.codelibs.fess.helper.SystemHelper;
  import org.codelibs.fess.util.ComponentUtil;
  
  /**
   * Job for purging old log entries from the system.
   * This job removes old crawling sessions, search logs, job logs, and user info logs
   * based on configured retention periods. It helps maintain system performance by
   * preventing log tables from growing too large.
   */
  public class PurgeLogJob {
  
      /** Logger instance for this class */
      private static final Logger logger = LogManager.getLogger(PurgeLogJob.class);
  
      /**
       * Default constructor for PurgeLogJob.
       * Creates a new instance of the log purging job with default settings.
       */
      public PurgeLogJob() {
          // Default constructor
      }
  
      /**
       * Executes the log purging job.
       * Performs the following cleanup operations:
       * - Purges old crawling sessions
       * - Purges search logs older than configured days
       * - Purges job logs older than configured days
       * - Purges user info logs older than configured days
       * - Updates job log status
       *
       * @return a string containing the execution result and any error messages
       */
      public String execute() {
          final CrawlingInfoService crawlingInfoService = ComponentUtil.getComponent(CrawlingInfoService.class);
          final SearchLogService searchLogService = ComponentUtil.getComponent(SearchLogService.class);
          final JobLogService jobLogService = ComponentUtil.getComponent(JobLogService.class);
          final UserInfoService userInfoService = ComponentUtil.getComponent(UserInfoService.class);
          final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
  
          final StringBuilder resultBuf = new StringBuilder();
  
          // purge crawling sessions
          try {
              crawlingInfoService.deleteBefore(systemHelper.getCurrentTimeAsLong());
          } catch (final Exception e) {
              logger.error("Failed to purge crawling sessions.", e);
              resultBuf.append(e.getMessage()).append("\n");
          }
  
          // purge search logs
          try {
              final int days = ComponentUtil.getFessConfig().getPurgeSearchLogDay();
              if (days >= 0) {
                  searchLogService.deleteBefore(days);
              } else {
                  resultBuf.append("Skipped to purge search logs.\n");
              }
          } catch (final Exception e) {
              logger.error("Failed to purge search logs.", e);
              resultBuf.append(e.getMessage()).append("\n");
          }
  
          // purge click logs
          try {
              final int days = ComponentUtil.getFessConfig().getPurgeSearchLogDay();
              if (days >= 0) {
                  searchLogService.deleteClickLogBefore(days);
              } else {
                  resultBuf.append("Skipped to purge click logs.\n");
              }
          } catch (final Exception e) {
              logger.error("Failed to purge click logs.", e);
              resultBuf.append(e.getMessage()).append("\n");
          }
  
         // purge favorite logs
         try {
             final int days = ComponentUtil.getFessConfig().getPurgeSearchLogDay();
             if (days >= 0) {
                 searchLogService.deleteFavoriteLogBefore(days);
             } else {
                 resultBuf.append("Skipped to purge favorite logs.\n");
             }
         } catch (final Exception e) {
             logger.error("Failed to purge favorite logs.", e);
             resultBuf.append(e.getMessage()).append("\n");
         }
 
         // purge job logs
         try {
             final int days = ComponentUtil.getFessConfig().getPurgeJobLogDay();
             if (days >= 0) {
                 jobLogService.deleteBefore(days);
             } else {
                 resultBuf.append("Skipped to purge job logs.\n");
             }
         } catch (final Exception e) {
             logger.error("Failed to purge job logs.", e);
             resultBuf.append(e.getMessage()).append("\n");
         }
 
         // purge user info
         try {
             final int days = ComponentUtil.getFessConfig().getPurgeUserInfoDay();
             if (days >= 0) {
                 userInfoService.deleteBefore(days);
             } else {
                 resultBuf.append("Skipped to purge user info logs.\n");
             }
         } catch (final Exception e) {
             logger.error("Failed to purge user info.", e);
             resultBuf.append(e.getMessage()).append("\n");
         }
 
         // update job logs
         try {
             jobLogService.updateStatus();
         } catch (final Exception e) {
             logger.error("Failed to purge job logs.", e);
             resultBuf.append(e.getMessage()).append("\n");
         }
 
         return resultBuf.toString();
     }
 
 }